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Preparation and characterization of electrospun LiFePO4/carbon complex improving rate performance at high C-rate |
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| Authors: | Sei-Hyun Lee Min-Jung Jung Ji Sun Im Kyou-Yoon Sheem Young-Seak Lee |
| Institution: | 1. Department of Electrical and Electronic Engineering, Korea Polytechnic College, Daejeon, 300-702, Republic of Korea 2. Department of Applied Chemistry and Biological Engineering, Chungnam National University, Daejeon, 305-764, Republic of Korea 3. Energy Lab., CRD Center, Samsung SDI, Suwon, Gyeonggi-do, 443-390, Republic of Korea |
| Abstract: | LiFePO4/carbon complexes were prepared by electrospinning to improve rate performance at high C-rate and their electrochemical properties were investigated to be used as a cathode active material for lithium ion battery. The LiFePO4/carbon complexes were prepared by the electrospinning method. The prepared samples were characterized by SEM, EDS, XRD, TGA, electrometer, and electrochemical analysis. The LiFePO4/carbon complexes prepared have a continuous structure with carbon-coated LiFePO4 and the LiFePO4 in LiFePO4/carbon complex has improved thermal stability from carbon coating. The conductivity of LiFePO4/carbon complex heat-treated at 800 °C is measured as 2.23 × 10?2 S cm?1, which is about 106–107 times more than that of raw LiFePO4. The capacity ratio of coin cell manufactured from raw LiFePO4 is 40%, whereas the capacity ratio of coin cell manufactured from LiFePO4/carbon complex heat-treated at 800 °C is 61% (10 C/0.1 C). The improved rate performance of LiFePO4/carbon complex heat-treated at 800 °C is due to the carbon coating and good electrical connection. |
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